ACPI / hotplug / PCI: Runtime resume bridge before rescan
If a PCI bridge (or PCIe port) that is runtime suspended gets an ACPI hotplug event, such as BUS_CHECK we need to make sure it is resumed before devices below the bridge are re-scanned. Otherwise the devices behind the port are not accessible and will be treated as hot-unplugged. To fix this, resume PCI bridges from runtime suspend while rescanning. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -675,6 +675,8 @@ static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
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if (bridge->is_going_away)
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return;
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pm_runtime_get_sync(&bridge->pci_dev->dev);
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list_for_each_entry(slot, &bridge->slots, node) {
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struct pci_bus *bus = slot->bus;
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struct pci_dev *dev, *tmp;
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@ -694,6 +696,8 @@ static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
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disable_slot(slot);
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}
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}
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pm_runtime_put(&bridge->pci_dev->dev);
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}
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/*
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